Hi dear, sleeping on the side is normal. Babies keep changing sleeping positions just like us. Stomach ache would cause baby to cry and be restless. So the sleep position is a myth. About urinating, if babies are disturbed in between the peeing, they would stop. As long as there are minimum 6- 7 wet nappies and baby is not showing discomfort while peeing, therre is not much to worry. Also check if urine is yellow. Don't measure the water. Since its summer, give as much as baby wants.